Effect of pre-aging on bake hardening properties of 6016 aluminum alloy for car body

doi:10.13251/j.issn.0254-6051.2020.06.013

Abstract

Abstract: Effects of different pre-aging treatments on microstructure and mechanical properties of 6016 aluminum alloy before and after baking were studied by means of hardness test, tensile test and transmission electron microscope. The results show that 6016 aluminum alloy has a strong ability of hardening by natural aging. The hardness of 6016 aluminum alloy after 24 h of natural aging is 45.6% higher than that of solid solution alloy. But after prolonged natural aging for more than 24 h, the hardness of the alloy has little change. The bake hardening effect of 6016 aluminum alloy can be improved by pre-aging treatment. After the pre aging with the process of heating at 550 ℃for 30 min solution and aging at 160 ℃ for 10 min, the yield strength and elongation of 6016 aluminum alloy are 131.4 MPa and 24.7%, respectively, then baking at 175 ℃ for 30 min, the yield strength of the alloy reaches 199.5 MPa, and the bake hardening value (BH) is 68.1 MPa, which is an ideal heat treatment process for 6016 aluminum alloy panel.

Key words: 6016 aluminum alloy, natural aging, pre-aging treatment, bake hardening

CLC Number:

TG146.2

Li Peng, Zhao Luyan. Effect of pre-aging on bake hardening properties of 6016 aluminum alloy for car body[J]. Heat Treatment of Metals, 2020, 45(6): 60-62.

References

[1]郑玉林, 徐燕萍, 黄相博, 等. 低温预时效对6016铝合金汽车板烘烤硬化性能的影响[J]. 轻合金加工技术, 2014, 46(5): 33-37.
Zheng Yulin, Xu Yanping, Huang Xiangbo, et al. Effect of low temperature pre-aging on bake hardening properties of 6016 aluminum alloy automobile panel[J]. Light Alloy Processing Technology, 2014, 46(5): 33-37.
[2]王鹏龙, 李辉, 曹零勇, 等. 预时效对6016铝合金烘烤硬化性能的影响[J]. 金属热处理, 2018, 43(4): 129-133.
Wang Penglong, Li Hui, Cao Lingyong, et al. Effect of pre aging on bake hardening properties of 6016 aluminum alloy[J]. Heat Treatment of Metals, 2018, 43(4): 129-133.
[3]刘蒙. 预时效对6016铝合金时效硬化和烤漆性能的影响[J]. 热加工工艺, 2019, 48(8): 229-231.
Liu Meng. Effect of pre aging on aging hardening and paint properties of 6016 aluminum alloy[J]. Hot Working Technology, 2019, 48(8): 229-231.
[4]盈亮, 申国哲, 胡平, 等. AA6016铝材烘烤硬化性能研究[J]. 机械工程学报, 2011, 47(10): 19-24.
Ying Liang, Shen Guozhe, Hu Ping, et al. Study on bake hardening properties of AA6016 aluminum[J]. Journal of Mechanical Engineering, 2011, 47(10): 19-24.
[5]高冠军, 李勇, 李家栋, 等. 预时效及预应变对汽车用AA6016合金析出行为的影响[J]. 材料热处理学报, 2016, 37(6): 76-81.
Gao Guanjun, Li Yong, Li Jiadong, et al. Effect of pre aging and pre strain on precipitation behavior of AA6016 alloy for automobile[J]. Transactions of Materials and Heat Treatment, 2016, 37(6): 76-81.
[6]葛丽丽, 李永兵, 陆兴, 等. 6016铝合金汽车板材预时效处理工艺研究[J]. 锻压技术, 2014, 39(1): 113-117.
Ge Lili, Li Yongbing, Lu Xing, et al. Study on the pre aging treatment process of 6016 aluminum alloy automobile plate[J]. Forging Technology, 2014, 39(1): 113-117.
[7]刘文义. 形变热处理过程中温变形程度对AA7085铝合金组织和性能的影响[J]. 热加工工艺, 2018, 47(2): 220-223.
Liu Wenyi. Effect of temperature deformation degree on the structure and properties of AA7085 aluminum alloy during thermomechanical treatment[J]. Hot Working Technology, 2018, 47(2): 220-223.
[8]李辉, 张华, 祝贞凤, 等. 预时效时间对汽车用6016铝合金组织与性能的影响[J]. 金属热处理, 2016, 41(12): 149-152.
Li Hui, Zhang Hua, Zhu Zhenfeng, et al. Effect of pre aging time on Microstructure and properties of 6016 aluminum alloy for automobile[J]. Heat Treatment of Metals, 2016, 41(12): 149-152.

[1]	Yang Chunmiao, Wang Shan, Wang Shuhui, Li Yanzhen, Liu Wenwen. Influence of pre-aging time on microstructure and properties of 7A85 aluminum alloy during RRA process [J]. Heat Treatment of Metals, 2022, 47(3): 44-47.
[2]	Ding Xuan, Gan Yurong, Zhang Chunju, Wang Liqiang, Yang Mingqiu, Li Hui. Effect of intermediate annealing on microstructure and properties of 6016 aluminum alloy [J]. Heat Treatment of Metals, 2021, 46(8): 174-179.
[3]	Wang Shan, Wang Shuhui, Liu Wenwen, Teng Dunbo, Zhang Riqiang, Wang Xuqiang, Xiang Kangning. Influence of aging treatment on hardening response and intergranular corrosion of 7A20 aluminum alloy [J]. Heat Treatment of Metals, 2021, 46(7): 173-177.
[4]	Li Dalin, Zhu Pengcheng, Wang Ping, Lü Zhengfeng, Zhang Shanshun. Influence of intermediate annealing on Roping pattern, microstructure and properties of cold rolled 6016 aluminum alloy plate [J]. Heat Treatment of Metals, 2021, 46(11): 157-160.
[5]	Wang Wenying, Wang Hui, Qu Shiyong. Bake hardening behavior of transformation induced plasticity steel TRIP590 [J]. Heat Treatment of Metals, 2020, 45(8): 43-46.
[6]	Wei Maoyuan, Wang Hongzhen, Zhang Hong, Teng Dunbo. Effect of pre-aging treatment on hardening response and microstructure of Al-Zn-Mg-Cu alloy [J]. Heat Treatment of Metals, 2020, 45(7): 90-93.
[7]	Jiang Shaojing, Wang Zuping. Effect of natural aging effect and pre-aging treatment on microstructure and properties of 7A20 aluminum alloy [J]. Heat Treatment of Metals, 2020, 45(10): 60-63.
[8]	Xiao Lairong, Wei Daoming, Zhao Xiaojun, Cai Zhenyang, Piao Shengming. Effect of natural aging on microstructure and properties of GT35 alloy [J]. HTM, 2020, 45(1): 65-68.
[9]	Li Hui1,2, Zhang Hua2, Zhu Zhenfeng1, Zhao Qi 1, Jiang Haitao3. Influence of pre-aging time on microstructure and mechanical properties of 6016 aluminum alloy for automobile [J]. HTM, 2016, 41(12): 149-152.